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I use this one to show borders on the active Explorer window in windows 10. The border isn't shown there by default, which means that on a white background, you have no clue where the border is.

Reg.exe Add "HKCU\Control Panel\Desktop" /v "UserPreferencesMask" /t REG_BINARY /d 9E1E078012000000 /f

Simply set it once and let it roam by capturing it using the product of your choice.

I don't know if this will work for 2019, but I wrote a doc for myself on how to configure visual effects for W10 after wanting to deal with the same issue.

OK, thank you guys, looks like borders/shadows is a better solution than dealing with color scheme, as accent is also applied to start menu tiles. also all these color settings are ignored by some apps e.g Teams/Office